Experimental Validation of IMM Algorithm for Carrier Phase Tracking Through Interference

Wengxiang Zhao and Boris Pervan

Peer Reviewed

Abstract:	In this paper, we develop a carrier phase estimation algorithm to allow GPS receivers to maintain continuous signal tracking through wideband radio frequency interference events. Due to the nature of the GPS signal, carrier phase estimation is a hybrid estimation problem, requiring simultaneous estimation of the discrete-time navigation data bits and the continuous carrier phase. We use an interacting multiple model algorithm with two measurement models corresponding to the two possible choices of navigation data bits (+1 and -1) over each 20 ms coherent integration interval. At the end of each interval, we extract the final state vector estimate by combining the two modes’ estimation results using their likelihood functions. We present both simulation and experimental results to evaluate the performance of the phase estimator during wideband interference events.
Published in:	Proceedings of the 2020 International Technical Meeting of The Institute of Navigation January 21 - 24, 2020 Hyatt Regency Mission Bay San Diego, California
Pages:	315 - 319
Cite this article:	Zhao, Wengxiang, Pervan, Boris, "Experimental Validation of IMM Algorithm for Carrier Phase Tracking Through Interference," Proceedings of the 2020 International Technical Meeting of The Institute of Navigation, San Diego, California, January 2020, pp. 315-319. https://doi.org/10.33012/2020.17145
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